Why do all the ignorant liberals lump McCain and Bush together?

Why do all the ignorant liberals lump McCain and Bush together? I dont see anyone lumping Obama with Clinton? Not all republicans are the same. Saying Bush and McCain are the same is like saying Obama plans to sell our military secrets to the chineese just like Clinton did. And do none of the Obama clones see that he is really a communist and not a democrat? I am seriously losing faith in my countrys ability to look beyond the lies and fresh face that is Obama.